Evolution of the Golfo San Jorge Basin: structure and tectonic regime

Evolution of the Golfo San Jorge Basin: structure and tectonic regime. The Golfo de San Jorge Basin is a basin developed to the east of the first foothills of the Patagonian Cordillera between 44° and 48° S latitude, which has a complex geological history. Its basement was structur...

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Autor principal: Ramos, V.A.
Formato: JOUR
Materias:
basin evolution
extensional tectonics
fold and thrust belt
foreland basin
plate motion
subduction
tectonic evolution
Atlantic Ocean
San Jorge Gulf
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v72_n1_p263_Ramos
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00044822_v72_n1_p263_Ramos2023-10-03T13:59:08Z Evolution of the Golfo San Jorge Basin: structure and tectonic regime Ramos, V.A. basin evolution extensional tectonics fold and thrust belt foreland basin plate motion subduction tectonic evolution Atlantic Ocean San Jorge Gulf Evolution of the Golfo San Jorge Basin: structure and tectonic regime. The Golfo de San Jorge Basin is a basin developed to the east of the first foothills of the Patagonian Cordillera between 44° and 48° S latitude, which has a complex geological history. Its basement was structured by a large compressive strain associated with a Neopaleozoic collision, followed by important extensional periods linked to the Jurassic opening of the Weddell Sea. An extensional fracturing, associated with the opening of the South Atlantic in the Late Jurassic, is superimposed in an almost orthogonal orientation. An extensional regime prevailed during the Early Cretaceous, this time produced by subduction with extension governed by the absolute motion of the South American plate. The onset of compression in the Late Cretaceous controlled the tectonic load subsidence of the continental deposits of the Chubut Group in a foreland basin. This basin, with a highly segmented basement and no confined margins also favored the existence of extensional faults with subparallel orientation to the main compressive stress during the Late Cretaceous. This system prevailed during the early Paleogene, with a conspicuous stress rotation, culminating in the Oligocene with an incipient primary extension associated with an intraplate alkali basaltic volcanism. This was associated with a decrease in the absolute displacement of the South American plate. The structure of the basin obtained the present geometry in the Neogene with the final development of the Bernárdides fold and thrust belt. © 2014, Asociacion Geologica Argentina. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v72_n1_p263_Ramos
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic basin evolution
extensional tectonics
fold and thrust belt
foreland basin
plate motion
subduction
tectonic evolution
Atlantic Ocean
San Jorge Gulf
spellingShingle basin evolution
extensional tectonics
fold and thrust belt
foreland basin
plate motion
subduction
tectonic evolution
Atlantic Ocean
San Jorge Gulf
Ramos, V.A.
Evolution of the Golfo San Jorge Basin: structure and tectonic regime
topic_facet basin evolution
extensional tectonics
fold and thrust belt
foreland basin
plate motion
subduction
tectonic evolution
Atlantic Ocean
San Jorge Gulf
description Evolution of the Golfo San Jorge Basin: structure and tectonic regime. The Golfo de San Jorge Basin is a basin developed to the east of the first foothills of the Patagonian Cordillera between 44° and 48° S latitude, which has a complex geological history. Its basement was structured by a large compressive strain associated with a Neopaleozoic collision, followed by important extensional periods linked to the Jurassic opening of the Weddell Sea. An extensional fracturing, associated with the opening of the South Atlantic in the Late Jurassic, is superimposed in an almost orthogonal orientation. An extensional regime prevailed during the Early Cretaceous, this time produced by subduction with extension governed by the absolute motion of the South American plate. The onset of compression in the Late Cretaceous controlled the tectonic load subsidence of the continental deposits of the Chubut Group in a foreland basin. This basin, with a highly segmented basement and no confined margins also favored the existence of extensional faults with subparallel orientation to the main compressive stress during the Late Cretaceous. This system prevailed during the early Paleogene, with a conspicuous stress rotation, culminating in the Oligocene with an incipient primary extension associated with an intraplate alkali basaltic volcanism. This was associated with a decrease in the absolute displacement of the South American plate. The structure of the basin obtained the present geometry in the Neogene with the final development of the Bernárdides fold and thrust belt. © 2014, Asociacion Geologica Argentina. All rights reserved.
format JOUR
author Ramos, V.A.
author_facet Ramos, V.A.
author_sort Ramos, V.A.
title Evolution of the Golfo San Jorge Basin: structure and tectonic regime
title_short Evolution of the Golfo San Jorge Basin: structure and tectonic regime
title_full Evolution of the Golfo San Jorge Basin: structure and tectonic regime
title_fullStr Evolution of the Golfo San Jorge Basin: structure and tectonic regime
title_full_unstemmed Evolution of the Golfo San Jorge Basin: structure and tectonic regime
title_sort evolution of the golfo san jorge basin: structure and tectonic regime
url http://hdl.handle.net/20.500.12110/paper_00044822_v72_n1_p263_Ramos
work_keys_str_mv AT ramosva evolutionofthegolfosanjorgebasinstructureandtectonicregime
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